How can I simplify this Taylor expansion?

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SUMMARY

The discussion centers on simplifying the Taylor expansion of the function \( \frac{1}{\sqrt{1+x^2}} \). The correct expansion is derived from the binomial series, yielding \( 1 - 0.25x^2 \) for small values of \( x \). Participants clarify that the expansion does not include an \( x^3 \) term, emphasizing the importance of correctly applying the binomial theorem for negative exponents.

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  • Understanding of Taylor series and expansions
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  • Basic calculus concepts, particularly derivatives
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ninevolt
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I want to show this taylor expansion:

\frac{1}{\sqrt{1+{x}^{2}}} \rightarrow x^2


what I keep getting is something to the x^3 could some one please help me with this simple expansion?
 
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(1+x^2)^-0.5
= 1-0.25(X^2) there is no x^3 okay
 

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